OLED Display Device Trench Segmentation for Crosstalk Prevention

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Solution Overview

Problem

In OLED display devices, crosstalk between adjacent pixels can occur due to the connection of the organic layer, leading to reduced definition and color chromaticity, which existing technologies have not adequately addressed.

Innovation Solution

A display device configuration featuring a substrate with an insulating layer, a first electrode, a rib with an opening overlapping the electrode, an organic layer covering the electrode and rib, and a trench filled with a filling member, where the organic layer is divided by trenches in the rib boundaries, preventing crosstalk between subpixels and improving display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the organic layer is formed continuously across adjacent pixels, then the manufacturing process is simplified, but crosstalk occurs between pixels reducing definition and color chromaticity

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidpixel definition and color chromaticity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The organic layer is segmented into separate portions for adjacent pixels by introducing trenches in the rib structure. These trenches divide the continuous organic layer into discrete sections, preventing crosstalk while maintaining a relatively simple manufacturing process using standard deposition techniques.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The trench structure acts as an intermediary barrier between adjacent pixels. By filling the trench with insulating material, a physical and electrical barrier is created that prevents organic material from one pixel from contacting and interfering with adjacent pixels, thus eliminating crosstalk.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If trenches are introduced to separate organic layers, then crosstalk is prevented, but device structure becomes more complex

Engineering Contradiction:

Improvepixel separation and crosstalk preventionVSAvoidrib and trench structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The rib structure serves multiple functions: it provides mechanical support, defines pixel boundaries, and houses the trench structures that prevent crosstalk. The opening in the rib allows electrode contact while the trench portion provides isolation, making the rib a multi-functional element that reduces overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The trench structure is nested within the rib structure. The rib contains the trench as an integrated feature rather than adding a separate external structure. This nesting approach minimizes additional complexity by incorporating the separation function within the existing boundary structure.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS20230380222A1Display device

Publication Date: 2023.11.23 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a display device includes a substrate, an insulating layer, a first electrode layer, a rib including an opening which overlaps the first electrode, and a trench which does not overlap the first electrode, an organic layer which includes a light emitting layer and covers the first electrode and the rib, a filling member in the trench, and a second electrode covering the organic layer, the rib and the filling member. The organic layer includes a first portion covering the first electrode, a second portion covering a portion of the rib between the opening and the trench, and a third portion located in the trench and apart from the second portion.